Re: [Gnuplot-info] How to ignore "popen failed"?

[Tatsuro M. <tma...@ya...>]

>>  ----- Original Message -----

>>>   From: theozh 
>>>   To: gnuplot-info
>>>   Cc: 
>>>   Date: 2017/7/28, Fri 04:42
>>>   Subject: Re: [Gnuplot-info] How to ignore "popen failed"?
>>> 
>>>   Hi Iva,
>>>   thank you for this observation.
>>>   Yes, I typically start my scripts under wgnuplot.exe, where the 
> original
>>>   code terminates when no file is found.
>>>   If I start the same code under the gnuplot.exe terminal it works fine!
>>> 
>>>   Maybe somebody can explain why there is this difference and maybe
>>>   whether or how it's possible to make it behave the same under 
>>  wgnuplot.exe?
>>> 
>>>   So, for the time being, no need for extra software like awk, cygwin,
>>>   Perl, wrapper-Script, ...
>>>   Thanks, Theo.
>>> 
>> 
>>  What happens you execute the script on wgnuplot_pipes.exe?
>> 
>>  Tatsuro
>> 
>> 
> In windows binary distribution, there is a file named README-Windows.txt
> There described 
> 
> * wgnuplot.exe:  GUI version and the default gnuplot executable. As of version 5 
> 
>   it emulates pipe functionality.
>   
> * wgnuplot_pipes.exe:  Variant with full pipe functionality at the expense of
>   an additional console window.
> 
> * gnuplot.exe:  Text (console) mode version of the gnuplot executable with full
>   pipe functionality as it is common on other platforms. In contrast to
>   wgnuplot.exe, this program can also accept commands on stdin (standard input)
>   and print messages on stdout (standard output). It replaces pgnuplot.exe and
>   is recommended to be used with 3rd party applications using gnuplot as graph
>   engine, like e.g. Octave (www.octave.org).
> 
> Perhaps what you met is side effect? of pipe emulation.
> 
> I have tried 
> 
> flist=system ("dir /B *.dat")
> in the folder where no *.dat on wgnuplot_pipes.exe
> A message 'File not found' appears in the additional console  and  
> "popen failed" does not appear.
> I have tried on wgnuplot_pipes.exe
> 
> I think that workaround at present is to use wgnuplot_pipes.
> 
> BTW, please open a bug ticket on 
> https://sourceforge.net/p/gnuplot/bugs/
> 
> This topic should be discussed there but not gnuplot-info list in my opinion.
> 
> Tatsuro 
> Thanks, Tatsuro, for that hint. Haven't tried so far.
> Well, then it also seems to work :-).
> So, problem solved...?!

I have post a mail before seeing your reply.
OK. I will open bug ticket.

Tatsuro